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Old 09-24-2019, 06:08 PM   #11 (permalink)
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Today, my starting pH was 7.69. My kh is 9.
Your tank water is highly buffered. pH drop is slight. There's no way to guess on your CO2 from tank water pH. Your drop checker is more accurate.

I've been doing some CO2 research... If you want more CO2 available for plants, you should add RO to bring down the pH & kH. Less than 7pH, and less than 2 kH. Do this instead of pumping in more CO2 that'll kill your fish.
When pH is above 7ish, only about 50% is CO2. The other is converted to bicarbonate, HCO3.

Lowering your lights is the first step for algae control though.

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Old 09-24-2019, 06:13 PM   #12 (permalink)
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Your tank water is highly buffered. pH drop is slight. They're no way to guess on your CO2 from tank water pH. Your drop checker is more accurate.
Ok. Thanks. That's so odd. I don't add anything to the water. I do have some rocks in the tank but I can't imagine they are limestone. They are smooth river rocks that have a sandy feel to them. It is well water. Could the well water be buffering it that much straight out of the tap?
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Old 09-24-2019, 06:36 PM   #13 (permalink)
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I've added more info to the previous post about water chemistry.
Could be your tap. Test your tap water. You could be sitting on top of a mountain of limestone.
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Old 09-24-2019, 06:41 PM   #14 (permalink)
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Default Re: Need some advice

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I've added more info to the previous post about water chemistry.
Could be your tap. Test your tap water. You could be sitting on top of a mountain of limestone.
Gotcha. We definitely have a lot of lime and iron in our water. We get the typical white crusty buildup on things and the red ring in the old toilet bowl. Can I use distilled water for now? An RO unit is a little out of my budget and I would have to drive an hour and a half to get to any.
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Old 09-24-2019, 06:45 PM   #15 (permalink)
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Default Re: Need some advice

Yup, distilled will work as well. Do it gradually, fish really hate water parameter changes. They'll die.

You can also only grow plants that like CO2, HCO3 and not worry about messing with your water chemistry.

There's a cheap way to alter water chemistry. In a separate container, add hydrochloric acid to the water. It'll react to the Calcium carbonate, to lower pH and kH. I don't know the exact ratio. Let it sit for a few days.
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Old 09-24-2019, 06:59 PM   #16 (permalink)
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Default Re: Need some advice

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Yup, distilled will work as well. Do it gradually, fish really hate water parameter changes. They'll die.

You can also only grow plants that like CO2, HCO3 and not worry about messing with your water chemistry.

There's a cheap way to alter water chemistry. In a separate container, add hydrochloric acid to the water. It'll react to the Calcium carbonate, to lower pH and kH. I don't know the exact ratio. Let it sit for a few days.
Ok. Sounds good.
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